Miroslav Bendik already made few interesting posts how to use Qt on A13 which we blogged about.
Now he made script which boots linux in less 1 second and you can build the same image using his GitHub scripts https://github.com/mireq/a13-olinuxino-autobuild
In his post at linuxos.sk he explains what he did
Here is video to see A13 booting Linux and GUI. Note that there is 2 seconds delay before the GUI is started so you can see and read the messages: